Audemars Piguet Comparison Guide: Royal Oak Models & Sizes
Start with the decision you are actually making: collection, generation, size or movement. Each comparison isolates the differences that change fit, ownership and price without assuming that the newest or most expensive reference is automatically best.
Specifications below describe the named standard references. AP has produced many material, dial and complication variants, so the complete reference remains the controlling product identity.
Quick answer: choose the AP family first, then resolve one variable—generation, diameter or chronograph architecture. Condition and exact reference can outweigh a newer calibre or a larger case.
Reviewed by the Superlative Watch Co. Buying Desk •
See the references in context
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Choose the comparison that resolves the decision
A reference comparison is most useful after the collection is known. If you are still deciding whether you want an integrated bracelet, a deliberately larger sports chronograph or a rounder modern AP case, begin with the three-family comparison. If Royal Oak is settled, determine whether the question is generation, diameter or chronograph architecture.
| Buyer question | Best guide | What it isolates |
|---|---|---|
| Which AP family fits my use? | Royal Oak vs. Offshore vs. Code 11.59 | Design language, wrist presence, bracelet or strap, movement choices and condition risks. |
| Which modern 41 mm Royal Oak? | 15500 vs. 15510 | Two Calibre 4302 generations with dial and ergonomic differences. |
| Which 39 mm Jumbo generation? | 15202 vs. 16202 | Calibre 2121 lineage versus Calibre 7121. |
| Should I choose 37 or 41 mm? | 15550 vs. 15510 | Actual case, movement and integrated-bracelet fit differences. |
| Which 41 mm Royal Oak Chronograph? | 26331 vs. 26240 | Calibre 2385 versus integrated flyback Calibre 4401. |
Royal Oak generation comparisons
Royal Oak 15500 vs. 15510
Compare two 41 mm Selfwinding generations that share Calibre 4302 but differ in dial treatment, bracelet evolution and exact configuration availability.
Read the guide →Royal Oak 15202 vs. 16202
Compare the 39 mm Jumbo before and after the transition from historic Calibre 2121 to modern Calibre 7121.
Read the guide →Generation changes matter most when they alter a movement, case thickness, bracelet articulation, dial balance or service proposition. They matter less when the buyer prefers a discontinued dial and the individual older watch has substantially better condition or value.
Discontinued does not mean obsolete. It means the supply is finite and the buyer must pay greater attention to originality, service history, exact suffix and replacement components.
Royal Oak 37 mm vs. 41 mm
The current standard steel 15550 and 15510 are not merely one design scaled up or down. The 37 mm 15550 is 9.1 mm thick and uses Calibre 5900 with a stated 60-hour power reserve. The 41 mm 15510 is 10.5 mm thick and uses Calibre 4302 with a stated 70-hour reserve. AP rates representative steel references in both families to 50 metres.
The integrated bracelet, case corners and first links expand visual presence. Wrist shape and the way the first links articulate can matter as much as circumference. The 37 vs. 41 mm guide uses neutral fit guidance; neither size should be assigned rigidly by gender.
Royal Oak Chronograph 26331 vs. 26240
The named standard steel references are both 41 mm, but the experience changes. AP lists the 26331ST at 11 mm thick with Calibre 2385. AP lists the 26240ST at 12.4 mm thick with integrated flyback Calibre 4401, whose architecture is visible through a sapphire caseback.
The later watch adds a modern manufacture movement and flyback function, while the earlier generation is thinner and offers dial configurations some buyers prefer. The 26331 vs. 26240 guide treats movement, fit, chronograph testing and service together.
Royal Oak, Offshore or Code 11.59
Royal Oak
The defining integrated-bracelet AP, with unusually visible sensitivity to bezel and bracelet finishing.
Royal Oak Offshore
A purposefully larger and sportier family with guards, pushers, rubber or straps and broad material experimentation.
Code 11.59
A round-fronted collection with an octagonal middle case, openworked lugs, curved crystal and major modern AP calibres.
Do not assign one water-resistance rating, size or movement to an entire family. Each collection includes materially different references. Use the three-family comparison to choose the architecture, then verify the exact product specifications.
Apply condition after the specification table
A crisp earlier reference may be a stronger purchase than an over-refinished successor. Inspect Royal Oak bezel geometry and bracelet transitions; Offshore guards, pushers, rubber, strap and clasp; and Code 11.59 crystal, bezel, middle case and openworked lugs.
Use the AP condition and polishing guide before treating any comparison as final. Then confirm the complete reference with the reference-number guide and keep individual serials private.
Reference families used in the AP comparisons
Compare these exact watches after deciding which collection, size, movement, material and condition best suit you. Open each listing for its photographs and current purchase details.
Audemars Piguet comparison FAQs
Which AP comparison should I read first?
If the collection is undecided, start with Royal Oak vs. Offshore vs. Code 11.59. If Royal Oak is already chosen, use the generation, size or chronograph comparison that matches the remaining question.
Is a newer AP reference always better?
No. A newer reference may add a movement, function or ergonomic update, but an earlier reference can have a preferred dial, thinner case, lower price or better individual condition.
Which AP comparison matters most for wrist fit?
The 37 vs. 41 mm Royal Oak guide isolates current Selfwinding sizes. Offshore buyers should also compare thickness, guards and strap footprint, while Code 11.59 buyers should review the curved lugs and side profile.
Can a discontinued AP be the better purchase?
Yes. Discontinued references can remain desirable for their movement, dial, proportions, thickness or price. Exact condition, originality, service and completeness become especially important.
Should market price decide between two AP references?
Price is one input, not the conclusion. Compare exact configuration, condition, fit, movement, completeness, service exposure and the transaction protections attached to the individual watch.
Sources and methodology
AP Royal Oak collection · AP Royal Oak design evolution · AP Chronicles: Royal Oak Jumbo models
Technical specifications and historical claims are checked against Audemars Piguet and AP Chronicles. For current price, photographs and availability, see the individual Superlative Watch Co. watch listing.
Editorial review: August 23, 2026. Superlative Watch Co. is an independent luxury-watch dealer and is not affiliated with or authorized by Audemars Piguet. Product availability, pricing and specifications can change. Brand names and trademarks belong to their respective owners.